Fly-screen.



M. L. MATHESO N.

FLY SGREEN. APPLICATION FILED iAILZO, 1910.

969,644. Patented Sept. 6,1910.

MILLARD L. MATHESON, OF VIRGINIA, MINNESOTA.

FLY-SCREEN.

Specification of Letters Patent.

Patented Sept. 6, 1910.

Application filed January 20, 1910. Serial No. 539,041.

useful Improvements in Fly-Screens, of

which the following is a specification.

My invention pertains to fly screens such as embody fly exits; and it consists in the peculiar and advantageous exit and exitcontrolling means, hereinafter described and definitely claimed.

In the drawings accompanying and forming part of this specification: Figure 1 is an elevation of the inner side of a screen embodying my invention. Fig. 2 is a detail section, on an enlarged scale, taken in the plane indicated by the line 22 of Fig. 1. Fig. 3 is a view similar to Fig. 2, but showing the exit as open. Fig. i is an enlarged detail section taken in the plane of the line 4.4 on Fig. l, and illustrating the knucklejoint between the side bars of the exit frame and the main frame, and also illustrating the rabbets at the upper ends of said side bars.

Similar letters designate corresponding parts in all the views of the drawings, refer-ring to which:

A is the top bar of the screen frame, having in the forward sides of its end portions recesses a, one of which is shown in full lines in Fig. l, and B B are the side bars of said frame. In the innersides of their upper portions said side bars B have recesses b which communicate with the recesses a and are rounded at their lower ends as indicated by c, for an important purpose hereinafter set forth.

C C are the side bars of my novel exit frame. The upper ends of said side bars C are provided with reduced portions d adapted to enter the rabbets a when the exit frame is closed, and the lower portions of the bars are pivotally connected at c to the side bars B, and their lower ends are rounded and disposed in the lower rounded ends 0 of the recesses I), so as to form compact and strong and durable knuckle joints, one of which is clearly shown in Fig. 4.

D is a top strip of molding or the like arranged exteriorly of the screen frame and connected and movable with the upper ends of the side bars C comprised in the exit frame.

E is an upright strip of molding or the like of which two will be employed, one at the forward side of each side bar B, and F is a section of wire screen. The lower portions of the strips E are nailed or otherwise secured to the faces of the side bars B, and the lower portion of the screen section F is interposed and secured between the lower portions of the bars B and strips E. The upper portions of the strips E are left free to move toward and from the faces or outer sides of the side bars B, and the upper portion of the screen section F is connected to and movable outwardly and inwardly with the upper portions of the strips E, the top strip D and the side bars C of the exit frame; the edges of the said upper portion of the screen section being interposed between the strips E and side bars G, and connected thereto by nails f or other suitable means.

It will be readily understood from the foregoing that when the exit frame described is in the position shown in Fig. 3 an opening is afl'orded at the top of the screen, and hence flies in an apartment can walk up the screen section F and out through the said opening; and it will also be understood that when the exit frame is moved from the position shown in Fig. 3 back to that shown in Figs. 1, 2 and 4:, the improved screen forms as eflectual a bar to the passage of flies as the ordinary onepiece fly screen.

In addition to the exit frame described, my invention comprises means for controlling the said framec'. 6., for swinging the same outwardly and inwardly and adjusta-bly maintaining it in its open and closed positions. The said means comprises headed projections G on the inner sides of the side bars C, headed projections H 011 the inner sides of the side bars B, and vertical endwise adjustable bars I. Each of the bars I is preferably formed of a single piece of sheet-metal, and has its lower end bent at a right angle to afford a finger-piece J, and also has vertical slots K and an inclined slot L; the vertical slots K receiving the headed projections H on the adjacent side bar B, and the inclined slot L receiving the headed projection G on the adjacent,

side bar G of the exit frame.

Obviously when the bars I are moved endwise upward from the position shown in Fig. 2 to that shown in Fig. 3, the inclined slots L cooperating with the projections Gr will move the exit frame to its open position, and by virtue of the friction between the parts, the said frame will be retained in said position and against casual movement. Then when the bars I are moved downward, the exit frame will be closed, and by reason of the friction between the parts, will be retained in that position and against casual movement.

It will be noted here that the controlling means are simple and inexpensive, and therefore add but little to the cost of the screen, and this notwithstanding the fact that the said controlling means enables a person at the inner side of the screen to expeditiously and easily open and close the exit frame as occasion demands.

lVhile I have shown and described one form of my invention, it is to be understood that I am not limited to the details or the form or relative arrangement of parts disclosed, but that modifications may be made therein without departing from the spirit thereof.

Having described my invention, what I claim and desire to secure by Letters-Patent, is:

1. A fiy screen comprising a main frame, an exit frame carried by and movable outward from the main frame to afford an exit opening and having side bars and projections on the inner sides thereof, and vertically movable bars guided in the main frame and having inclined slots receiving the said project-ions on the side bars of the exit frame.

2. A fly screen comprising a main frame having side bars in which are recesses rounded at their lower ends, an exit frame having side bars arranged in the recesses of and pivotally connected to the side bars of the main frame and also having the lower ends of its side bars rounded and opposed to the rounded lower ends of the recesses to I form knuckle-joints, and means cooperating with the main frame and the exit frame to detachably secure the latter in open and closed positions.

3. A fly screen comprising a main frame having side bars in which are recesses rounded at their lower ends and also having a top bar in which are rabbets in communication with said recesses and further having headed projections on the side bars, below the recesses, side bars arranged in the re cesses of and pivotally connected to the side bars of the main frame and having their lower ends rounded and opposed to the lower rounded ends of the recesses to form knuckle-joints and also having their upper ends reduced and adapted to seat in the rabbets of the top bar, headed project-ions on the inner sides of said side bars, upright strips having their lower portions connected to the side bars of the main frame and their upper portions free from said side bars, a top strip connected with the upper ends of said upright strips, a screen section having a lower portion interposed and secured between the side bars of the main frame and the lower portions of the upright strips and also having an upper portion interposed and secured between the pivoted side bars and the upper portions of the strips, and vertically movable bars having angular lingerpieces at their lower ends and having vertical slots receiving the headed projections on the side bars of the main frame and further having inclined slots receiving the headed projections on the pivoted side bars.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

MILLARD L. MATHESON.

Vitnesses R. C. PICKERING, ED CURTIss. 

